level: Level of messages that this transport should log (defaults to info).

account: The name of the Windows Azure storage account to use

key: The access key used to authenticate into this storage account

partition: The value to use for the PartitionKey in each row (defaults to 'log'). The RowKey is an auto-generated GUID.

columns: If true, the transport will store the metadata key/value pairs in individual columns (this can be helpful when querying table storage for log entries with specific metadata values). The default is to store the entire meta value as a single JSON string in a 'meta' column.